3. Short Term Memory


#1


Getting an error about NaN. Can't seem to figure out why.

Calling cashRegister.add(3.2) set the cashRegister.total to NaN instead of 3.2

https://www.codecademy.com/en/courses/close-the-super-makert/0/3?curriculum_id=506324b3a7dffd00020bf661#


var cashRegister = {
    total: 0,
//insert the add method here    
    add: function (itemCost) {
        this.total += this.itemCost;
    },
    
    scan: function (item) {
        switch (item) { 
        case "eggs": 
            this.add(0.98); 
            break;
        
        case "milk": 
            this.add(1.23); 
            break;
        
        //Add other 2 items here
        case "magazine": 
            this.add(4.99); 
            break;
        
        case "chocolate": 
            this.add(0.45); 
            break;
            
        }
        return true;
    }
};

//Scan 2 eggs and 3 magazines
cashRegister.scan("eggs");
cashRegister.scan("eggs");
cashRegister.scan("magazine");
cashRegister.scan("magazine");
cashRegister.scan("magazine");
//Show the total bill
console.log('Your bill is '+cashRegister.total);

Any ideas?


#2

Got it.

Had this:

add: function(itemCost){
        this.total += this.itemCost;
    },

Should've been this:

add: function(itemCost){
        this.total += itemCost;
    },

#3

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